Choosing a DIY mini split for 2026? MRCOOL delivers 24 SEER2, while Zone Air...

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Choosing a DIY mini split for 2026? MRCOOL delivers 24 SEER2, while Zone Air offers 23 SEER2. The real call: best value above -15°F, or Hyper Heat that keeps heating down to -22°F. Match the unit to your winter lows.